Rejuvenate comes from re- ('again') + Latin juvenis ('young') + -ate, modeled on Latin juvenescere ('to grow young'). The historical chain includes Latin re-, Latin juvenis, and Proto-Indo-European *h₂yuhₓen-. The quoted older senses, "again", "young", and "to grow young", supply the semantic anchors for rejuvenate. The formation is best read as suffixal, compound, and borrowed: the word rejuvenate carries its older form-history into a compact English lexical shape. In present English it is used as a verb, "to make young, fresh, or vigorous again". English derivatives include rejuvenation, rejuvenated, rejuvenating, and rejuvenator; related English forms include juvenile, junior, and juvenescent. The result is a verb whose etymology preserves both the older form and the later English specialization.